Crane heavy object falling accident usually refers to the accident of personal injury or mechanical failure caused by the falling of heavy objects such as hooks and slings from the air during the operation of the crane. I would like to share with you the types and causes of common weight loss accidents of cranes.
There are several crane loss accidents, such as decoupling, rope dropping, hook breaking and rope breaking
Unhooking accident refers to the falling accident of heavy objects caused by the detachment of heavy objects, hoisting ropes or special lifting appliances from the hook mouth of the hook.
The main cause of decoupling accident is the lack of hook protection device; Failure of hook protection device; Improper hoisting method and excessive opening caused by hook mouth deformation of hook.
Rope breaking accident refers to the breaking of hoisting rope or steel wire rope due to overload.
The main causes of breaking of hoisting rope are overload hoisting and breaking of steel wire rope; Failure of lifting limit switch causes over winding and breaking of steel wire rope; The steel wire rope is cut off due to rope crushing caused by inclined hoisting and cable-stayed; The steel wire rope is broken due to fatigue deformation, wear and damage caused by long-term use and lack of maintenance, which still meets or exceeds the scrapping standard.
Hook breaking accident refers to the falling accident of heavy objects caused by hook breaking.
Most of the causes of hook breaking accidents are the defect of hook material. Due to the reduction of long-term wear section, the hook has reached the hook scrapping limit standard, but it is still used or often overloaded, resulting in fatigue damage, fracture damage and hook breaking and falling accident.
Rope off accident refers to the casualty and damage accident caused by the falling and collapsing of heavy objects from the bound hoisting rope.
The main cause of rope falling off accident is the improper binding method and key points of heavy objects, resulting in the slipping of heavy objects; Improper selection of hoisting center of gravity, resulting in eccentric load hoisting or falling off of heavy objects due to unstable hoisting center; The suspended load swings due to collision, impact and vibration, resulting in the loss of heavy objects.
The loss accident of hoisting machinery mainly occurs in the material taking and winding system of the hoisting mechanism. In addition to rope disconnection, hook disconnection, rope breakage and hook breakage, the fixation of both ends of each hoisting wire rope is also very important, such as whether the limit safety ring of the wire rope on the drum can be guaranteed to be more than 2 turns, and whether there is lowering limit protection, Whether the pressing plate fixing and wedge fixing structure of the steel wire rope on the drum device are safe and reasonable. In addition, the loss accident will also occur in the case of steel wire rope off groove (from drum rope groove) or off wheel (from pulley).
In the daily use of cranes, enterprises must do a good job in maintenance, find problems in time and eliminate possible hidden dangers.
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